Self‐consistent calculation of the motion of a sheet of ions in the magnetosphere

摘要: Time-dependent magnetospheric electric fields have been computed, including the effects of Birkeland currents from inner edge a sheet ions that moves under influence computed fields. Ionospheric are also taken self-consistently into account with use time-independent model ionospheric conductivity includes day-night asymmetry and auroral enhancements but neglects parallel to magnetic field. Ion precipitation neutral winds neglected. The behavior ion studied in series calculations, following results. (1) In agreement conclusions E. T. Karlson, L. P. Block, V. M. Vasyliunas, D. W. Swift, Alfven layer (inner sheet) found reduce field earthward small value by time steady state is reached; however, different parts eliminated at rates; one component nightside relaxes near its low asymptotic few minutes, whereas dayside takes hours relax. (2) If brought tail large cross-tail stays large, generally touches magnetopause boundary layer; decrease can cause contract form complete ring. (3) For parameters used, potential 134 kv will bring ring current protons about L = 4; results calculations support idea convection low-energy storm current; minimum geocentric distance which be roughly proportional (ημ/Φ0σρ)1/3, where η number per unit flux, μ moment, Φ0 potential, σρ an average height-integrated Pedersen on dayside. (4) naturally produces dividing line local midnight, such particles arriving west drift west, those east east; this characteristic often observed motions barium clouds arcs.